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Railway tunnel. Photo: Road Infrastructure Agency |
Half of the construction activities for the Zheleznitsa tunnel on the Struma highway have already been completed. The primary liner of the facility on the south side reached 931 m for the left pipe and 838 m for the right. 837 m of right pipe and 838 m of left pipe have been excavated from the north, reports the Road Infrastructure Agency.
Laying of the secondary tunnel lining has also started. On the south side, the concrete works on the walls and the vault on the right pipe are 132 m, and on the north side, 186 m.
The tunnel is built using a new Austrian method, digging approximately one and a half meters, two in each pipe and direction in one day, and immediately after that, the primary lining of the facility is made with fasteners, shotcrete and anchors.
Construction activities started in October last year and the site is working 24 hours without interruption.
Zheleznitsa is the longest road tunnel ever built in Bulgaria. It will have two independent pipes for movement in the direction, the length of each one will be about 2 km. The facility will have all the necessary systems for lighting, ventilation, video surveillance, fire alarm, and intelligent traffic management system.
At the same time, a bridge was built along the direct route, passing over the Suha Reka river, a retaining wall on the direct route, another bridge over the Suha Reka river along with a tunnel service on the southern portal of the tunnel from Simitli town and a helicopter pad.
Work is also being done on the viaduct, which is in front of the Railway, which runs from Sofia to the Tower, as well as on the section after the tunnel. The viaduct has an upper structure completed on the highway to Sofia. The bridge crosses 6 obstacles: the Struma River, the E79 road, the current and future railway line, the municipal road and the tunnel service road. The road to Sofia is 560 m long and the road to the Tower is 510 m. The installation consists of two bridges for the two lanes, each of 21 sections. Each segment is pushed one by one, so there is no need to stop traffic on the E79 Sofia-Kulata road and on the railway line. This year the push on the road to Sofia was completed, and on the road to the Tower the tension of the first section is approaching.
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